Meteorologist is a free weather program for OS X. It allows users total
control over their weather viewing, including simultaneous interlaced
weather reports from multiple weather servers, multiple weather
locations, weather alerts and much more.

Seasonality Core turns your Mac into an advanced home weather station,
showing you the latest forecast, observations, and maps for locations
worldwide.
Our back-end collects and processes data from around the globe. From
weather station observations to forecast model data and advanced
imagery, we have all your data needs covered.